Master Bedroom: Arbor Hill Estate in Fort Washington, Pa.

The master suite is a sanctuary with his-and-hers imported marble baths, dressing rooms, a sitting room and an office. A private flight of stairs leads to a tower retreat with 360-degree panoramas of the entire property. Situated on 29 picturesque acres, this 40,000-square-foot modern residence was designed by world-renowned architect Rafael Viñoly.